Those sites actively encourage you to view other people's sites in exchange for views to yours. This is against google adsense ToS.

Google prohibits the use of any form of payment for views of your site or ad clicks. This includes such sites as link exchanges. If you post a link exchange address on hubpages, you'll usually get a "Malicious Links" alert, because of this.

Ok, so i really want to know how i can get more traffic to my hubs. I know i have to write a hub people want to read and yes i take part in the hub community but i am pretty new to this. What websites do you people use...

Free Traffic its very popular topic in net ,and like new seo master. but i dont getting any traffic from google /yahoo or any other free search engine .but i am getting more traffic from my friends groups site (like...